If the compressor starts and runs check the run capacitor for visual signs such as bulging of the casing or oil leakage which would indicate a bad run capacitor. A bad run capacitor will cause the compressor current draw to be above normal resulting in the overload protector tripping. If the compressor Hums then clicks the compressor is bad.

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Have you been using this projector for some time?
With time, dust gathers in 'air filters' and it hinders the movement of air though the projector. When this happens, projector gets overheated. To prevent damage, it shuts off automatically.
You haven't given much details, but if you think overheating is the problem, open the top cover and clean dust, specially from air filters.

if the lamp lights and then shuts down, replace the lamp. it's at the end of it's life. to rule out overheating, blow the projector out with canned air. dust retains the heat that the projector is trying to expell. also see if all of the fans are working. if you do get an image for a short time, try to get into the menu to reset the settings to factory default. lastly, if all else fails, you have a ballast issue. unfortunately, infocus no longer sells parts for this model.

Does the lamp actually light up and project? If not, it's probably a dead bulb. Are there any flashing lights that might be displaying an error code? How dow you know it's not overheating? Remove the filter and give it a good cleaning. Some projectors measure airflow and, even though the heat hasn't built up, the projector shuts down because it predicts overheating will occur due to insufficient airflow.